ICD-10-CM Tabular Index · Chapter 6 · FY 2027 G30–G32
Other degenerative diseases of the nervous system (G30-G32) ICD-10-CM
The G30–G32 section covers other degenerative diseases of the nervous system with 27 ICD-10-CM diagnosis codes, of which 21 are billable in fiscal year 2027. The section is organized into the 3 code ranges listed below.
✓ Built from the official CMS FY 2027 datasetEffective Oct 1, 2026 – Sep 30, 2027
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the G30–G32 Code Range
These conditions involve deterioration of the nervous system, including Alzheimer’s disease and disorders of the brain or spinal cord. Alzheimer’s disease begins gradually with problems in memory, judgment, attention and problem-solving, followed by a broader loss of thinking abilities.
G30 separates Alzheimer’s disease by early or late onset, with other and unspecified categories. G31 includes frontotemporal dementia, brain degeneration, degeneration due to alcohol, and other or unspecified nervous system diseases. G32 separates spinal cord degeneration from other specified nervous system degeneration in diseases classified elsewhere.
Questions About This Page
How many codes are in the G30-G32 range?
The G30-G32 range contains 27 ICD-10-CM diagnosis codes in FY 2027. 21 of them are billable, and the rest are category headers that organize the section.
What conditions does G30-G32 cover?
The range covers other degenerative diseases of the nervous system. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
Alzheimer's dementia senile and presenile forms
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
mild neurocognitive disorder due to known physiological condition F06.7
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
mild neurocognitive disorder due to known physiological condition F06.7
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
